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Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Depreciation and Other Amortization Expenses [Line Items]    
Amortization period of lease hold improvements 4 years  
Depreciation and amortization expense $ 2.3us-gaap_DepreciationDepletionAndAmortization $ 2.5us-gaap_DepreciationDepletionAndAmortization